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RT2859A

更新时间： 2024-09-25 16:37:07
品牌 Logo 应用领域
立锜 - RICHTEK /
页数 文件大小 规格书
17页 316K
描述
3A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter

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RT2859A 技术参数

Status：ActiveVin (min)(V)：4.5
Vin (max)(V)：18Number of Outputs：1
Vout (min)(V)：0.765Vout (max)(V)：7
Preset Vout(V)：Output Adj. Method：Resistor
Iout (max)(A)：3Current Limit (typ)(A)：5
Freq (typ)(kHz)：650Freq (min)(kHz)：
Freq (max)(kHz)：Ext Sync：No
Ron_HS (typ)(mOhm)：70Ron_LS (typ)(mOhm)：70
Iq (typ)(mA)：1Features：ACOT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;OVP;PSM;Power Good;UVP
Package Type：WQFN3x3-16

RT2859A 数据手册

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®
RT2859A/B  
3A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter  
General Description  
The RT2859A/B are high-performance 650kHz 3A step-  
down regulators with internal power switches and  
synchronous rectifiers. They feature quick transient  
response using their Advanced Constant On-Time  
(ACOTTM) control architecture that provides stable  
operation with small ceramic output capacitors and without  
complicated external compensation, among other benefits.  
The input voltage range is from 4.5V to 18V and the output  
is adjustable from 0.765V to 7V.  
to avoid low-frequency interference while the RT2859A  
features a power-saving discontinuous operating mode at  
light loads.  
Features  
Fast Transient Response  
Steady 650kHz Switching Frequency at all Load  
Current (RT2859B)  
Discontinuous Operating Mode at Light Load  
(RT2859A)  
The proprietaryACOTTM control improves upon other fast-  
response constant on-time architectures, achieving nearly  
constant switching frequency over line, load, and output  
voltage ranges. Since there is no internal clock, response  
to transients is nearly instantaneous and inductor current  
can ramp quickly to maintain output regulation without  
large bulk output capacitance. The RT2859A/B are stable  
with and optimized for ceramic output capacitors.  
3A Output Current  
Advanced Constant On-Time (ACOTTM) Control  
Optimized for Ceramic Output Capacitors  
4.5V to 18V Input Voltage Range  
Internal 70mΩ Switch and 70mΩ Synchronous  
Rectifier  
0.765V to 7V Adjustable Output Voltage  
Externally-Adjustable, Pre-Biased Compatible Soft-  
Start  
With internal 70mΩ switches and 70mΩ synchronous  
rectifiers, the RT2859A/B display excellent efficiency and  
good behavior across a range of applications, especially  
for low output voltages and low duty cycles. Cycle-by-  
cycle current limit, input under-voltage lockout, externally-  
adjustable soft-start, output under- and over-voltage  
protection, and thermal shutdown provide safe and smooth  
operation in all operating conditions.  
Cycle-by-Cycle Current Limit  
Optional Output Discharge Function  
Output Over- and Under-voltage Shut Down  
Latched (RT2859ALGQW/RT2859BLGQW Only)  
With Hiccup Mode (RT2859AHGQW/RT2859BHGQW  
Only)  
Input Under-Voltage Lockout  
Thermal Shutdown  
The RT2859A and RT2859B are each available in  
the WQFN-16L 3x3 package, with exposed thermal pads.  
The RT2859B switches continuously even at light loads  
RoHS Compliant and Halogen Free  
Simplified Application Circuit  
RT2859A/B  
V
VIN  
V
IN  
SW  
OUT  
VCC  
BOOT  
VS  
Power Good  
VREG5  
PGOOD  
FB  
Input Signal  
EN  
SS  
VREG5  
GND PGND  
Copyright 2019 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DS2859A/B-05 May 2019  
www.richtek.com  
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